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From: "bugdal at aerifal dot cx" <sourceware-bugzilla@sourceware.org> To: glibc-bugs@sources.redhat.com Subject: [Bug nptl/14744] New: kill -32 $pid or kill -33 $pid on a process cancels a random thread Date: Sat, 20 Oct 2012 01:36:00 -0000 [thread overview] Message-ID: <bug-14744-131@http.sourceware.org/bugzilla/> (raw) http://sourceware.org/bugzilla/show_bug.cgi?id=14744 Bug #: 14744 Summary: kill -32 $pid or kill -33 $pid on a process cancels a random thread Product: glibc Version: unspecified Status: NEW Severity: minor Priority: P2 Component: nptl AssignedTo: unassigned@sourceware.org ReportedBy: bugdal@aerifal.cx CC: drepper.fsp@gmail.com Classification: Unclassified Signals 32 and 33 are used internally by NPTL. There's nothing wrong with this, as they are not advertised as being available to applications (SIGRTMIN shows up as 34 in multi-threaded applications, if I recall). However, if an outside process sends these signals, the target process acts on the signal as if it were a cancellation request for whichever thread happened to receive the signal. This could cause severe breakage and data corruption in applications which are not written to use cancellation and lack cleanup handlers. I am unsure whether the impact is limited to user error (issuing the kill command manually) or could arise in other ways. In any case, for robustness, I think the signal handler should be a no-op unless pthread_cancel was really called in the application. -- Configure bugmail: http://sourceware.org/bugzilla/userprefs.cgi?tab=email ------- You are receiving this mail because: ------- You are on the CC list for the bug.
next reply other threads:[~2012-10-20 1:36 UTC|newest] Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top 2012-10-20 1:36 bugdal at aerifal dot cx [this message] 2014-01-10 20:29 ` [Bug nptl/14744] " carlos at redhat dot com 2014-01-10 22:07 ` neleai at seznam dot cz 2014-01-10 22:43 ` bugdal at aerifal dot cx 2014-01-12 18:32 ` carlos at redhat dot com 2014-01-12 18:34 ` carlos at redhat dot com 2014-01-12 23:25 ` bugdal at aerifal dot cx 2014-01-16 16:47 ` carlos at redhat dot com 2014-06-14 12:50 ` fweimer at redhat dot com 2021-06-10 1:44 ` adhemerval.zanella at linaro dot org
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